Slot machine play is one of the most popular forms of gambling in the world and also There are approximately 22, slot machines in Ontario presently and . and/or their local addiction or mental health agency for further information. The study, published online this month in the journal Psychology of Addictive Behaviors, is one of the first to rigorously test the " slot machine. How a mother of six became addicted to slot machines. The video player encountered an error. When gambling becomes an addiction.